Set a maximum selectable date as a string in the current dateFormat, or a number of days from today (e.g. +7) or a string of values and periods ('y' for years, 'm' for months, 'w' for weeks, 'd' for days, e.g. '+1m +1w')
Set a minimum selectable date as a string in the current dateFormat, or a number of days from today (e.g. +7) or a string of values and periods ('y' for years, 'm' for months, 'w' for weeks, 'd' for days, e.g. '-1y -1m')
So, if you want to go back 80 years and forward 0 days, you could do:
[[!input.datepicker?
&input_id=`dob`
&name=`dob`
&menu=`1`
&date_format=`dd-mm-yy`
&tplContainer=`input.datepicker.text`
&min_date=`-80y`
&max_date=`0`
&value=``
]]
Hope that helps.